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Prog. Theor. Phys. Supplement No.168 (2007) pp. 635-638

The In-Medium \barK N Interaction within a Chiral Unitary Approach

Laura Tolós,^1,* Angels Ramos^2,** and Eulogio Oset^3,***

¹FIAS, J. W. Goethe-Universität,
Ruth-Moufang-Str. 1, 60438 Frankfurt (M), Germany
²Departament d'Estructura i Constituents de la Matèria,
Universitat de Barcelona, Diagonal 647, 08028 Barcelona, Spain
³Departamento de Física Teórica and IFIC, Centro Mixto Universidad de Valencia-CSIC, Institutos de Investigación de Paterna,
Ap. Correos 22085, E-46071 Valencia, Spain

Abstract:

The s- and p-wave contributions to the \barK N interaction in dense nuclear matter are obtained using a chiral unitary approach. We perform a self-consistent calculation of the \barK self-energy including Pauli blocking effects, meson self-energies modified by short-range correlations and baryon binding potentials. We find that the on-shell factorization cannot be applied to evaluate the in-medium corrections to p-wave amplitudes. Furthermore, the Λ and Σ develop a mass shift of -30 MeV at saturation density while the Σ^* width increases to 80 MeV. We conclude that no deep and narrow \barK bound states could be observed.

URL : http://ptp.ipap.jp/link?PTPS/168/635/
DOI : 10.1143/PTPS.168.635

^*E-mail: tolos@fias.uni-frankfurt.de
^**E-mail: ramos@ecm.ub.es
^***E-mail: oset@ific.uv.es

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